Harlot

is said to be derived from Harlotta, the mother of William the
Conqueror, but it is more likely to be a corruption of horlet (a
little hireling), “hore” being the past participle of hyran (to
hire). It was once applied to males as well as females. Hence Chaucer
speaks of “a sturdy harlot ... that was her hostes man.” The word
varlet is another form of it.

He was gentil harlot, and a kinde;
A bettre felaw shulde man no wher finde